- Categories:
Semi-structured Data Functions (Type Predicates)
TYPEOF¶
Reports the type of a value stored in a VARIANT column. The type is returned as a string.
- See also:
Syntax¶
TYPEOF( <expr> )
Arguments¶
expr
The argument can be a column name or a general expression.
Returns¶
Returns a VARCHAR that contains the data type of the input expression, for example, BOOLEAN
, DECIMAL
, ARRAY
, OBJECT
, etc.
Usage Notes¶
The returned string might be
DECIMAL
even if the input is an exact integer, due to optimizations that change the physical storage type of the input.
Examples¶
Create a table that contains different types of data stored inside a VARIANT column, then use TYPEOF
to determine the data types of each piece of data.
Create and fill a table. Note that the
INSERT
statement uses thePARSE_JSON
function.create or replace table vartab (n number(2), v variant); insert into vartab select column1 as n, parse_json(column2) as v from values (1, 'null'), (2, null), (3, 'true'), (4, '-17'), (5, '123.12'), (6, '1.912e2'), (7, '"Om ara pa ca na dhih" '), (8, '[-1, 12, 289, 2188, false,]'), (9, '{ "x" : "abc", "y" : false, "z": 10} ') AS vals;Query the data:
select n, v, typeof(v) from vartab order by n; +---+------------------------+------------+ | N | V | TYPEOF(V) | |---+------------------------+------------| | 1 | null | NULL_VALUE | | 2 | NULL | NULL | | 3 | true | BOOLEAN | | 4 | -17 | INTEGER | | 5 | 123.12 | DECIMAL | | 6 | 1.912000000000000e+02 | DOUBLE | | 7 | "Om ara pa ca na dhih" | VARCHAR | | 8 | [ | ARRAY | | | -1, | | | | 12, | | | | 289, | | | | 2188, | | | | false, | | | | undefined | | | | ] | | | 9 | { | OBJECT | | | "x": "abc", | | | | "y": false, | | | | "z": 10 | | | | } | | +---+------------------------+------------+